From c011d3154350b087c566e24f0a0354aeb2f35917 Mon Sep 17 00:00:00 2001
From: Eric Christopher <echristo@apple.com>
Date: Fri, 1 Jul 2011 00:30:46 +0000
Subject: [PATCH] Add support for the ARM 't' register constraint. And another
 testcase for the 'x' register constraint.

Part of rdar://9119939

llvm-svn: 134220
---
 llvm/lib/Target/ARM/ARMISelLowering.cpp |  5 +++++
 llvm/test/CodeGen/ARM/inlineasm3.ll     | 20 ++++++++++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/llvm/lib/Target/ARM/ARMISelLowering.cpp b/llvm/lib/Target/ARM/ARMISelLowering.cpp
index 1141f42f14dc..4a78ad4bf2db 100644
--- a/llvm/lib/Target/ARM/ARMISelLowering.cpp
+++ b/llvm/lib/Target/ARM/ARMISelLowering.cpp
@@ -7484,6 +7484,7 @@ ARMTargetLowering::getConstraintType(const std::string &Constraint) const {
     case 'w': return C_RegisterClass;
     case 'h': return C_RegisterClass;
     case 'x': return C_RegisterClass;
+    case 't': return C_RegisterClass;
     }
   } else if (Constraint.size() == 2) {
     switch (Constraint[0]) {
@@ -7563,6 +7564,10 @@ ARMTargetLowering::getRegForInlineAsmConstraint(const std::string &Constraint,
       if (VT.getSizeInBits() == 128)
 	return RCPair(0U, ARM::QPR_8RegisterClass);
       break;
+    case 't':
+      if (VT == MVT::f32)
+	return RCPair(0U, ARM::SPRRegisterClass);
+      break;
     }
   }
   if (StringRef("{cc}").equals_lower(Constraint))
diff --git a/llvm/test/CodeGen/ARM/inlineasm3.ll b/llvm/test/CodeGen/ARM/inlineasm3.ll
index f09deb39f8c8..00257e1cdb3e 100644
--- a/llvm/test/CodeGen/ARM/inlineasm3.ll
+++ b/llvm/test/CodeGen/ARM/inlineasm3.ll
@@ -68,3 +68,23 @@ entry:
   %0 = tail call float asm "flds s15, $0", "=x"() nounwind
   ret float %0
 }
+
+; Radar 9307836 & 9119939
+
+define double @t7(double %y) nounwind ssp {
+entry:
+; CHECK: t7
+; CHECK: flds s15, d0
+  %0 = tail call double asm "flds s15, $0", "=x"() nounwind
+  ret double %0
+}
+
+; Radar 9307836 & 9119939
+
+define float @t8(float %y) nounwind ssp {
+entry:
+; CHECK: t8
+; CHECK: flds s15, s0
+  %0 = tail call float asm "flds s15, $0", "=t"() nounwind
+  ret float %0
+}